class Phone:
    IMEI = None
    producer = None
    
    def call_by_4g(self):
        print("4g通话")
        
class Phone2022:
    IMEI = None
    producer = None
    face_id =True
    
    def call_by_4g(self):
        print("4g通话")
        
    def call_by_5g(self):
        print("2022最新5g通话")